3961881709 has 2 divisors, whose sum is σ = 3961881710. Its totient is φ = 3961881708.

The previous prime is 3961881689. The next prime is 3961881727. The reversal of 3961881709 is 9071881693.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3868218025 + 93663684 = 62195^2 + 9678^2 .

It is a cyclic number.

It is not a de Polignac number, because 3961881709 - 2²¹ = 3959784557 is a prime.

It is a super-2 number, since 2×3961881709² = 31393013352217521362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3961881409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1980940854 + 1980940855.

It is an arithmetic number, because the mean of its divisors is an integer number (1980940855).

Almost surely, 2^3961881709 is an apocalyptic number.

It is an amenable number.

3961881709 is a deficient number, since it is larger than the sum of its proper divisors (1).

3961881709 is an equidigital number, since it uses as much as digits as its factorization.

3961881709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 3961881709 is about 62943.4802739728. The cubic root of 3961881709 is about 1582.3425313275.

The spelling of 3961881709 in words is "three billion, nine hundred sixty-one million, eight hundred eighty-one thousand, seven hundred nine".